TRMM 3B43卫星降水数据在京津冀地区的适用性研究

Research of TRMM3B43 satellite precipitation data applicability in Beijing-Tianjin-Hebei Region

以京津冀地区为研究区域,利用散点斜率法、相对偏差、均方根误差和相关系数法,对研究区域内176个国家级雨量站2006-2015年的实测降水资料在不同时空尺度下检验了同期TRMM(Tropical Rainfall Measurement Mission)卫星降水产品3B43 V7的适用性。结果表明:TRMM 3B43多年均降水量与站点实测降水时空分布规律一致,在不同时间尺度下具有良好的相关性,相关系数均在0.85以上,随时间尺度的增加精度有所降低;整体上TRMM 3B43降水数据略小于站点实测降水,在常年降水高值区域出现低估现象,季尺度上,夏季和冬季误差较大;就区域而言, TRMM 3B43在西北山地高原地区相对偏差和均方根误差均较小,相关系数基本在0.9以上,拟合精度较高,可信度较强。

Based on the precipitation data observed from 176 national benchmark climate stations and principal stations in Beijing-Tianjin-Hebei Region,the accuracy of the TRMM(Tropical Rainfall Measuring Mission Satellite)3 B43 V7 rainfall product is tested and analyzed with slope of scatter,relative deviation,root mean square error and correlation coefficient.The results show that the mean precipitation of TRMM 3 B43 is consistent with the observed precipitation,and has a good correlation in different time scales.The correlation coefficients are all above 0.85,and the precision decreases with the increase of time scales.The precipitation of TRMM 3 B43 is slightly smaller than the observed precipitation of the stations on the whole.The phenomenon of underestimation occurs in the regions with high annual precipitation.In seasonal scale,the precision is lower in summer and winter.Regionally,the relative deviation and root mean square error of TRMM 3 B43 in the northwest mountainous and plateau regions are smaller,the correlation coefficient is basically above 0.9,the fitting accuracy is higher with strong credibility.